Mount St. Helens in Washington State, USA, woke up in March 1980 after 1 quiet for more than one hundred years. On March 20, there was a 4.1 earthquake in the area. After that, the area felt many more earthquakes. Finally, on May 18, the volcano erupted and killed dozens of people.

The eruption destroyed the whole top of the mountain. Before, Mount St. Helens was 2975 meters 2; after the eruption, it was about 2600 meters. Scientists think that it 3 erupt again in a few hundred years.